Device for reducing internal combustion power tail gas emission concentration and control method thereof

The invention discloses a device for reducing the internal combustion power tail gas emission concentration. The device comprises a shell, a plurality of temperature probes, an air volume adjusting unit and a flow guide unit. The shell is provided with a fresh air inlet and a tail gas exhaust outlet, the temperature probes are evenly distributed at the tail gas exhaust outlet, the air volume adjusting unit is arranged in the shell, receives action instructions sent by a power pack of the diesel locomotive and is used for adjusting the volume of entering fresh air, and the flow guide unit is arranged at the fresh air inlet and used for guiding the fresh air to enter the shell. And the flow guide unit receives an action instruction sent by the internal combustion locomotive power pack and is used for adjusting the airflow direction of fresh air. According to the invention, the concentration of the tail gas and the dilution uniformity are indirectly tested by utilizing the multi-point test of the temperature fie